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vllm_c.cpp:1401:13: error: 'OrEmpty' has C-linkage specified, but returns user-defined type 'std::string' (aka 'basic_string<char>') which is incompatible with C [-Werror,-Wreturn-type-c-linkage] #192

Description

@dpblnt
-- The CXX compiler identification is Clang 21.1.8
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/lib/llvm/21/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for a CUDA compiler
-- Looking for a CUDA compiler - NOTFOUND
-- The C compiler identification is Clang 21.1.8
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/lib/llvm/21/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Found Python3: /usr/bin/python3.14 (found version "3.14.4") found components: Interpreter
-- Configuring done (0.8s)
-- Generating done (0.4s)

...

[ 24%] Building CXX object CMakeFiles/vllm.dir/src/vllm/entrypoints/openai/tool_parsers/abstract.cpp.o
[ 24%] Building CXX object CMakeFiles/vllm.dir/src/vllm/entrypoints/openai/tool_parsers/structural_tags.cpp.o
/mnt/storage/llm/vllm.cpp/src/capi/vllm_c.cpp:1401:13: error: 'OrEmpty' has C-linkage specified, but returns user-defined type
      'std::string' (aka 'basic_string<char>') which is incompatible with C [-Werror,-Wreturn-type-c-linkage]
 1401 | std::string OrEmpty(const char* s) { return s == nullptr ? std::string() : std::string(s); }
      |             ^
[ 25%] Building CXX object CMakeFiles/vllm.dir/src/vllm/entrypoints/openai/tool_parsers/detect.cpp.o
[ 25%] Building CXX object CMakeFiles/vllm.dir/src/vllm/entrypoints/openai/tool_parsers/utils.cpp.o
[ 25%] Building CXX object CMakeFiles/vllm.dir/src/vllm/entrypoints/openai/tool_parsers/hermes.cpp.o
[ 25%] Building CXX object CMakeFiles/vllm.dir/src/vllm/entrypoints/openai/tool_parsers/mistral.cpp.o
[ 25%] Building CXX object CMakeFiles/vllm.dir/src/vllm/entrypoints/openai/tool_parsers/llama.cpp.o
[ 25%] Building CXX object CMakeFiles/vllm.dir/src/vllm/entrypoints/openai/tool_parsers/llama4_pythonic.cpp.o
1 error generated.
gmake[2]: *** [CMakeFiles/vllm.dir/build.make:3621: CMakeFiles/vllm.dir/src/capi/vllm_c.cpp.o] Error 1
gmake[2]: *** Waiting for unfinished jobs....
gmake[1]: *** [CMakeFiles/Makefile2:1314: CMakeFiles/vllm.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2

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